<!DOCTYPE html>

<html>
	<head>
		<meta charset="utf-8" />
		<meta name="viewport" content="width=device-width" />
		<title>xlsx导出为json</title>
		<script src="js/jquery-3.6.0.min.js"></script>
		<script src="js/xlsx.core.min.js"></script>
	</head>
	<body>

		<div style="margin:20px">
			<p id="tips"></p>
			<input id="fileExcel" type="file" onchange="getExcelData(this)" style="width: 320px;">
		</div>
		<script>
			//读取Excel数据
			function getExcelData(obj) {
				$("#tips").html("正在读取，请稍后...");
				$("#fileExcel").css("display", "none");
				var reader = new FileReader();

				//文件加载完成后调用
				reader.onload = function(e) {
					var data = e.target.result;

					const workbook = XLSX.read(data, {
						type: 'array'
					})
					//获取json格式的Excel数据
					var jsonData0 = XLSX.utils.sheet_to_json(workbook.Sheets[workbook.SheetNames[0]], {
						defval: 'null' //单元格为空时的默认值
					});
					//表格存在多个 Sheet 可以使用下标获取数据
					//var jsonData1 = XLSX.utils.sheet_to_json(workbook.Sheets[workbook.SheetNames[1]], {});

					// 如果表格内存在日期，需要处理一下
					/* for (var i = 0; i < jsonData0.length; i++) {
						jsonData0[i]["日期"] = formatDate(jsonData0[i]["日期"]);
					} */
					download("data.json", JSON.stringify(jsonData0));
					$("#tips").html("");
					$("#fileExcel").css("display","block");
				};

				//加载文件
				reader.readAsArrayBuffer(obj.files[0]);
			}

			//下载文件
			function download(filename, text) {
				var pom = document.createElement('a');
				pom.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
				pom.setAttribute('download', filename);
				if (document.createEvent) {
					var event = document.createEvent('MouseEvents');
					event.initEvent('click', true, true);
					pom.dispatchEvent(event);
				} else {
					pom.click();
				}
			}

			//将excel日期转为字符串格式
			var format = "-";
			function formatDate(numb) {
				const time = new Date((numb - 1) * 24 * 3600000 + 1)
				time.setYear(time.getFullYear() - 70)
				const year = time.getFullYear() + ''
				const month = time.getMonth() + 1 + ''
				const date = time.getDate() - 1 + ''
				if (format && format.length === 1) {
					return year + format + month + format + date
				}
				return year + (month < 10 ? '0' + month : month) + (date < 10 ? '0' + date : date)
			}
		</script>
	</body>
</html>

